1 files changed, 1 insertions, 0 deletions
diff --git a/thread.c b/thread.c
index 23ed2bc07f..cf7affa424 100644
--- a/thread.c
+++ b/thread.c
@@ -4694,6 +4694,7 @@ Init_Thread(void)
 
     rb_thread_create_timer_thread();
 
+    /* suppress warnings on cygwin, mingw and mswin.*/
     (void)native_mutex_trylock;
 }